U.C.L.A. Rheumatology Pathophysiology of Disease Course Lecture,
Second Year Medical School 1997
Frequently Asked Questions Page 76
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#6 What is the most distinguishing feature to diagnose Ankylosing spondylitis?
Ankylosing spondylitis is an arthritis of the axial skeleton. In the extreme form, the patients develop a completely immobile spinal column. The single most important feature which distinguishes it from other back pain is that patients also have sacroiliitis, usually bilateral.
Figure 7. Xrays of Sacroiliitis
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sacroiliac joints.